After spending only two weeks in rehab, Charlie Sheen has already returned to his show Two and a Half Men — and one expert explains to HollywoodLife.com why the actor may be at risk

Charlie Sheenreturned to the set of his CBS sitcom Two and a Half Men on March 16 after spending two weeks in rehab for “preventative measures,” but is it too soon? Beverly Hills-based addiction expert Marty Brenner says given the actor’s rocky past with addiction, Charlie may have moved too quickly.

“Sometimes it’s good to get back to work and forget about what happened, but I think Charlie went back too soon,” Brenner told HollywoodLife.com March 17. “Because of everything that’s going on with Charlie right now, they really, really have to put the reigns on him so he doesn’t get stressed out and start drinking again.”

According to a source on set, Charlie’s first day back was “normal” and “good,” but anyone who leaks information about the production will be fired, reports TMZ. Charlie, 44, was accompanied by a sober minder, a companion or coach who helps recovering addicts stay on track.

“Charlie’s going right back into a stressful job with long hours, plus his treatment. That’s why they hired a sober companion,” Brenner explained, adding, “I hope they got a different one than they had before.”

Both Charlie and his wife, Brooke Mueller, 32, had sober minders during their domestic dispute Christmas morning in Aspen, but somehow their companions didn’t stop the couple from drinking. “The sober minders should have diffused that situation before it escalated,” Brenner said. “This new guy better be on Charlie 24/7 and be highly qualified.”

On March 15, Charlie pleaded not guilty in an Aspen court to all charges from the dispute, and must attend a three-day trial starting July 21.

Have YOU ever returned to work too quickly after going through major personal issues?